FreeBSD Man Pages

SND_MAESTRO3(4) FreeBSD Kernel Interfaces Manual SND_MAESTRO3(4)
NAMEsnd_maestro3 -- ESS Maestro3/Allegro-1 bridge device driver
SYNOPSIS
To compile this driver into the kernel, place the following lines in your
kernel configuration file:
devicesounddevicesnd_maestro3
Alternatively, to load the driver as a module at boot time, place the
following line in loader.conf(5):
snd_maestro3_load="YES"
DESCRIPTION
The snd_maestro3 driver provides support for the ESS Maestro3 and Alle-
gro-1 sound chips under the PCM framework. These chips are mostly found
in laptop computers and feature an AC97 mixer, a multi-channel sample
rate converter that can mix up to four digital audio streams in hardware,
recording support, and external volume control buttons.
The firmware for the sound processor is licensed under the GNU Public
License, and thus this driver is not included in the default GENERIC ker-
nel.
HARDWARE
The snd_maestro3 driver supports the following audio devices:
+o ESS Technology Allegro-1
+o ESS Technology Maestro3
DIAGNOSTICS
The hardware volume control buttons can be connected to two different pin
sets (GPIO or GD) on the chip, depending on the manufacturer. The driver
has no way of determining this configuration, so a hint may be used to
override the default guess. The default setting for hardware volume con-
trol assumes that GD pins are wired to control the hardware volume. For
systems that have the GPIO pins wired to the hardware volume control but-
tons, add the line ``hint.pcm.0.hwvol_config="0"'' to the file
/boot/device.hints to override the default setting.
SEE ALSOsound(4), loader.conf(5)HISTORY
The snd_maestro3 driver first appeared in FreeBSD 4.3.
AUTHORS
Scott Long <scottl@FreeBSD.org>
Darrel Anderson <anderson@cs.duke.edu>
FreeBSD 10.1 December 15, 2005 FreeBSD 10.1